Grinding-mill.



H. E. QUIGKBL. GRINDING MILL.

APPLIOATION 11Lsn 11011.12. 1912.

y Patented Ju1y1, 1913.

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M M C/'' N "Hmmm Q h y u I coLuMBIA PLANOURAPHc0..wASH|NdTON. D. C.

H. E. QUIGKEL. GRINDING MILL. .APPLICATION FILED NOV.12. 1912.

2 SHEETS-SHEET 2.

Patented July 1, 1913.

HOWARD E. QUICKEL, 0F DOVER, PENNSYLVANIA.

- GRINDINGr-IVIILL.

Specification of Letters Patent.

Patented July 1, 1913.

Application led November 12, 1912. Serial No. 730,991.

To all lwit-0m i may concern:

Be it known that I, HOWARD E. QUIoKnL, a citizen of the United States, residing at Dover, county of York, State of Pennsylvaiiia, have invented certain new and useful Improvements in Grinding-Mills, of which l the following is a specification.

This invention relates to grinding mills and more particularly to improvements in the means for supporting the usual thrust bearings .which take the end thrust due to the grinding operation.

One of the objects of the invention is to provide a simple and inexpensive construction which is adapted to automatically or manually release one of the thrust bearings .to permit axial movement of one of the grinding members or burs.

Another object is to provide the automatically releasing means with means for automatically restoring the parts to their normal position, and also to provide yielding means for the other thrust bearing adapted to prevent the grinding members or burs from striking.

With these and other objects in view the invention may be embodied in various mechanisms, one of which is illustrated in the accompanying drawings, in which:

Figure 1 is a horizontal section through a grinding mill embodying the invention. Fig. 2 is a fragmentary side elevation of the mill shown in Fig. 1, certain parts being shown in section. Fig. 3 is a perspective view of an improved form of bearing boX.

Referring to the drawings 10 indicates the frame of the machine which may be of any suitable construction and which carries the bearings 11 and 12. Arranged in the bearings 11 and 12 is a shaft 13 having arranged thereon a driving pulley 14 and a screw 15. The frame 10 also supports a suitable housing 16 for the stationary bur 17 this bur being provided with'an axial opening 1S, inv

which is arranged the screw 15. The housing 16 is provided with lugs 16, by means of which it is supported on the frame 10, and with an axial extension 19 which receives the material to be ground and which also bears against the face of the bearing 11 to take the end thrust in that direction.

The bur 17 is secured in the housing 16- by means of a suitable cement backing 20, and has arranged adjacent thereto the cooperating bur 21 'which is secured to a housing 22 by means of the cement backing 23.

The bur 21 rotates with the shaft 13 and a space 24 is provided between the bur 21 and the bur or bedstone 17, the material to be .ground being forced by the screw 16 into this space where the grinding is e'ected.

The parts thus far described are well known and may be of any preferred construction.

It will be obvious that when material is being ground in the space 24 there is a certain axial pressure on the grindingstones or burs which is taken up, in the case of the bedstone 17, by means of the bearing 11. In case of the stone 21, however, it is essen tial to provide means which normally holds vthe stone in the proper position for grinding and at the same time is yieldable under certain conditions. When the axial pressure on the stone 21 becomes excessive as when some foreign substance, such as a piece of rock or iron, gets between the stones it is necessary for the stone 21 to move axially in order to prevent damage being done and also to permit the foreign substance to escape from the space 24. For this purpose I have provided yieldable thrust bearings at the `ends of the shaft 13. These thrust bearings are preferably of similar construction and one is shown in section in Fig. 1. As will be observed these bearings comprise a casing 25, in which are arranged the bearing plates 26 and 27 provided with races for the balls 28. A set screw 29 is arranged axially in the casing 25 and bears against the center of the plate 26 and supports this plate. For the purpose of securing the plates together so as to prevent the balls from dropping out ywhen the parts are disassembled I have projvided the screw 30 which passes through a fcentral `opening in the plate 27 and is secured in the plate 26. vThe casings 25 are provided at their outer ends with a pair of spaced lugs 31 between which the support-ing `means for the bearing is arranged. In the casing of the thrust bearing at the right `hand end of Fig. 1, I have provided a supporting means which consists of a lever 32 which is fulcrunied on a bracket 33 secured y'pivotedto the links 39 and coperating with the latter to form a toggle. The links 39 are pivotally connected with a rod 40, which is slidably arranged in a bracket 41 and is provided with a screw-threaded portion 42, on which is arranged an adjustable wheel 43, the hub of which engages a suitable sleeve or abutment 44 carried by a bearing member 45.

The bearing member 45 is secured to the frame 10 and is provided with the spaced lugs 46 and 47, to which is pivoted the cam member 48 having a suitable handle 49. As will be seen from Fig. 2 the cam member 48 is in the form of an eccentrically pivoted circular disk which engages the end of the sleeve 44, a suitable recess 50 being provided in the sleeve to receive the cam member. The sleeve 44 has arranged therein the end of the rod 40 and thus supports the latter.

The links 38 and 39 are connected together by means of a pivot bolt- 51, this bolt also being connected with the upper end of the link 52, the lower end of this link being connected with a rod 53 passing through an abutment and being screw-threaded and having arranged thereon the nuts 55 and 56. A spring 57 is arranged between the nut 55 and the lower side of the abutment 54 and tends to draw the rod 53 downwardly through the abut-ment, the nut 56 limiting this downward movement by its enga-gement with the upper side of the abutment. As will be seen from Fig. 2 the nut 56 engages the abutment 54 when the toggle links 38 and 39 are in slightly open position so that this toggle is never fully closed. The nuts 55 and 56 are adjust-able on the rod 53 for the purpose of varying the tension of the spring 57 and the amount of closing of the toggle links, respectively.

The casing 25 1for the thrust bearing at the left hand end of Fig. 1 is supported by a bent lever 58 which bears against the rounded portion 34 of the casing 25 and has one end thereof connected with the frame 10 by means of the bracket 59 and the pivot bolt 60. The other end of the lever 58 is bent downwardly as indicated at 61 and has passing therethrough a rod 62 which is secured to the frame 10 and provided vvith the screw-threaded portion 63, on which is arranged the hand wheel 64, a spring 65 being arranged between this hand wheel and the downwardly extending portion 61 of the lever 58. The spring 65 thus forms an abutment for the end 61 of the lever 58 and determines the width of the space 24, and also acts as a buffer to stop the movement of the stone or bur 21 toward the bedstone 17 and thus prevent the stones from striking.

The operation of the mechanism is as follows: The arrangement of the lever 32, rods 35 and 40 and the toggle links 39 normally holds the stone 21 in definite relation to the stone 17, but when the axial pressure between the stones becomes excessive for any reason, as on account of some foreign substance being fed into the space 24, the toggle links 38 and 39 will yield and compress the spring 57 which will restore the links 38 and 39 to their normal position, and thus move the stone 21 back to its normal position, when the excessive pressure has been relieved, as by the escape of the object causing the same. As the stone 21 moves toward the stone 17 under the influence of the spring 57 the end 61 of the lever 58 engages the spring 65 which acts as a buffer and prevents the stones from striking.

lVhenever it is desired to manually release the mechanism t-he handle 49 .on the cam member 48 is ino-ved from the position shown in Fig. 2, thereby permitting the sleeve or abutment 44 to move toward the left.

The normal angular relation of the toggle links 38 and 39 can be varied by adjusting the position of t-he hand wheel 43 and the amount of pressure required to force the grinding stones apart can be varied by changing the tension of the spring 57.

In order to take the end thrust on the stone 17 I have provided the lower half of the bearing 11 wit-h a depending flange 66, which is engaged by the end of the extension 19 on the housing 16.

It will be understood by thoseskilled in the art that various changes may be made in the minor details of construction of the apparatus illustrated and described, within the scope of the appended claims and, therefore I do no-t wish to be limited to these exact details.

I-Iaving thus described the invention what is claimed as new is:

1. In a grinding machine, the combination of a rotatable and axially movable shaft, apair of spaced bearings for said shaft, a pair of coperating grinding members between said bearings and one of which is secured on said shaft, thrust bearings for normally holding said grinding members in definite spaced relation, means including an automatically operating spring-closed toggle for holding one of said thrust bearings, and means for adjusting the resistance of said toggle against opening.

2. In a grinding` machine, the combination of a rotatable and axially movable shaft, a pair of coperating grinding members, one of which is secured on said shaft, a thrust bearing at one end of said shaft, a pivotally supported lever having one end thereof engaging said bea-ring, a rigidly supported abutment, holding means pivoted to said lever and engaging said abutment and including a toggle device, spring means normally tending to close said toggle device, and means for limiting the extent of closing said device.

3. In a grinding machine, the combination of a rotatable and axially movable shaft, a pair of coperating grinding members, one of which is secured on said shaft, a thrust bearing at one end ofsaid shaft, a rigidly supported abutment, means including a member having a toggle device therein7 and engaging said abutment, for the purpose of supporting said thrust bearing, yieldable means normally tending to close said toggle device, and means for manually shifting said abutment. Y

4. In a grinding machine, the combination of a rotatable and axially movable shaft, a pair of coperating grinding members, one of which is secured on said shaft, thrust bearings for normally holding said grinding members in deiinite spaced relation, and means including an automatically operating spring closed toggle for holding one of said thrust bearings.

In testimony whereof` I aiiix my signature in presence of two Witnesses.

HOWARD E. QUICKEL. Witnesses B. M. KENT, ARTHUR L. BRYANT.

Copies of this patent may be obtained for iive cents each, by addressing the Commissioner of Patents,

Y Washington, D. G. 

